647384 has 8 divisors (see below), whose sum is σ = 1213860. Its totient is φ = 323688.

The previous prime is 647371. The next prime is 647399. The reversal of 647384 is 483746.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 647384.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647384.

It is an unprimeable number.

647384 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40454 + ... + 40469.

2⁶⁴⁷³⁸⁴ is an apocalyptic number.

It is an amenable number.

647384 is a deficient number, since it is larger than the sum of its proper divisors (566476).

647384 is a wasteful number, since it uses less digits than its factorization.

647384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80929 (or 80925 counting only the distinct ones).

The product of its digits is 16128, while the sum is 32.

The square root of 647384 is about 804.6017648502. The cubic root of 647384 is about 86.5075449777.

The spelling of 647384 in words is "six hundred forty-seven thousand, three hundred eighty-four".